English verb conjugation
COULD INTERFACE

Regular verb: interface - interfaced - interfaced

Affirmation

Simple form	V-ing form
I could interface you could interface she could interface we could interface you could interface they could interface	I could be interfacing you could be interfacing she could be interfacing we could be interfacing you could be interfacing they could be interfacing
Perfect	V-ing perfect
I could have interfaced you could have interfaced she could have interfaced we could have interfaced you could have interfaced they could have interfaced	I could have been interfacing you could have been interfacing she could have been interfacing we could have been interfacing you could have been interfacing they could have been interfacing

Negation

Simple form	V-ing form
I couldn't interface you couldn't interface she couldn't interface we couldn't interface you couldn't interface they couldn't interface	I couldn't be interfacing you couldn't be interfacing she couldn't be interfacing we couldn't be interfacing you couldn't be interfacing they couldn't be interfacing
Perfect	V-ing perfect
I couldn't have interfaced you couldn't have interfaced she couldn't have interfaced we couldn't have interfaced you couldn't have interfaced they couldn't have interfaced	I couldn't have been interfacing you couldn't have been interfacing she couldn't have been interfacing we couldn't have been interfacing you couldn't have been interfacing they couldn't have been interfacing

Interrogative form

Simple form	V-ing form
could I interface? could you interface? could she interface? could we interface? could you interface? could they interface?	could I be interfacing? could you be interfacing? could she be interfacing? could we be interfacing? could you be interfacing? could they be interfacing?
Perfect	V-ing perfect
could I have interfaced? could you have interfaced? could she have interfaced? could we have interfaced? could you have interfaced? could they have interfaced?	could I have been interfacing? could you have been interfacing? could she have been interfacing? could we have been interfacing? could you have been interfacing? could they have been interfacing?

Interro-negative form

Simple form	V-ing form
couldn't I interface? couldn't you interface? couldn't she interface? couldn't we interface? couldn't you interface? couldn't they interface?	couldn't I be interfacing? couldn't you be interfacing? couldn't she be interfacing? couldn't we be interfacing? couldn't you be interfacing? couldn't they be interfacing?
Perfect	V-ing perfect
couldn't I have interfaced? couldn't you have interfaced? couldn't she have interfaced? couldn't we have interfaced? couldn't you have interfaced? couldn't they have interfaced?	couldn't I have been interfacing? couldn't you have been interfacing? couldn't she have been interfacing? couldn't we have been interfacing? couldn't you have been interfacing? couldn't they have been interfacing?